Sea Shepherd handed over the baby vaquita corpse to the Mexican authorities and a necropsy will be performed to determine the cause of death. The most common cause in the Gulf of California for the vaquita is getting caught in one of the numerous illegal gillnets hidden underwater, set up to trap the totoaba bass. Both the vaquita and the totoaba are similar in size and once the vaquita becomes entangled in the net, it is unable to reach the surface of the water to breathe, causing it to drown.